Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/alttab-1.5.0/src/alttab.c
Examining data/alttab-1.5.0/src/alttab.h
Examining data/alttab-1.5.0/src/autil.c
Examining data/alttab-1.5.0/src/ewmh.c
Examining data/alttab-1.5.0/src/gui.c
Examining data/alttab-1.5.0/src/icon.c
Examining data/alttab-1.5.0/src/icon.h
Examining data/alttab-1.5.0/src/pngd.c
Examining data/alttab-1.5.0/src/pngd.h
Examining data/alttab-1.5.0/src/randr.c
Examining data/alttab-1.5.0/src/rp.c
Examining data/alttab-1.5.0/src/util.c
Examining data/alttab-1.5.0/src/util.h
Examining data/alttab-1.5.0/src/win.c
Examining data/alttab-1.5.0/src/x.c
Examining data/alttab-1.5.0/test/pngtest.c

FINAL RESULTS:

data/alttab-1.5.0/src/autil.c:36:13:  [4] (format) fprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
            fprintf(stderr, MSGPREFIX);
data/alttab-1.5.0/src/autil.c:40:9:  [4] (format) vfprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
        vfprintf(stderr, format, ap);
data/alttab-1.5.0/src/autil.c:51:5:  [4] (format) fprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
    fprintf(stderr, MSGPREFIX);
data/alttab-1.5.0/src/autil.c:53:5:  [4] (format) vfprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
    vfprintf(stderr, format, ap);
data/alttab-1.5.0/src/rp.c:116:15:  [4] (shell) popen:
  This causes a new program to execute and is difficult to use safely
  (CWE-78). try using a library call that implements the same functionality
  if available.
    if ((fp = popen("which ratpoison", "r"))) {
data/alttab-1.5.0/src/util.c:181:9:  [4] (shell) execv:
  This causes a new program to execute and is difficult to use safely
  (CWE-78). try using a library call that implements the same functionality
  if available.
        execv(exe, args);
data/alttab-1.5.0/src/gui.c:283:5:  [3] (random) srand:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
    srand(time(NULL));
data/alttab-1.5.0/src/icon.c:103:18:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
    char *home = getenv("HOME");
data/alttab-1.5.0/src/icon.c:104:19:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
    char *xdgdd = getenv("XDG_DATA_DIRS");
data/alttab-1.5.0/src/alttab.c:518:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char keys_pressed[32];
data/alttab-1.5.0/src/alttab.h:78:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char name[MAXNAMESZ];
data/alttab-1.5.0/src/gui.c:289:17:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
                char r[3];
data/alttab-1.5.0/src/icon.c:194:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char *icon_dirs[MAXICONDIRS];
data/alttab-1.5.0/src/icon.c:256:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char app[MAXAPPLEN];
data/alttab-1.5.0/src/icon.c:263:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char sx[5];
data/alttab-1.5.0/src/icon.c:264:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char sy[5];
data/alttab-1.5.0/src/icon.c:314:14:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
        ix = atoi(sx);
data/alttab-1.5.0/src/icon.c:317:14:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
        iy = atoi(sy);
data/alttab-1.5.0/src/icon.c:474:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char appl[MAXAPPLEN];
data/alttab-1.5.0/src/icon.h:43:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char app[MAXAPPLEN];        // application name; uthash key
data/alttab-1.5.0/src/icon.h:44:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char src_path[MAXICONPATHLEN];  // \0 -if not initialized or loaded from X window properties
data/alttab-1.5.0/src/pngd.c:241:20:  [2] (misc) fopen:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
    if (!(infile = fopen(pngpath, "rb"))) {
data/alttab-1.5.0/src/rp.c:48:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char buf[MAXRPOUT];
data/alttab-1.5.0/src/rp.c:137:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char buf[MAXRPOUT];
data/alttab-1.5.0/src/rp.c:167:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char arg2[arg2len];         // fits 'groups', 'gselect N'
data/alttab-1.5.0/src/rp.c:169:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char buf[MAXRPOUT];
data/alttab-1.5.0/src/rp.c:222:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char selarg[64];
data/alttab-1.5.0/src/rp.c:224:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char buf[MAXRPOUT];
data/alttab-1.5.0/src/util.c:73:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char etext[EM];
data/alttab-1.5.0/src/util.c:398:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char line[M];
data/alttab-1.5.0/src/util.c:525:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char line[104];
data/alttab-1.5.0/src/util.c:606:5:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
    memcpy(r, ret_prop, size);
data/alttab-1.5.0/src/util.c:676:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char xappname[MAXNAMESZ];
data/alttab-1.5.0/src/util.c:723:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char xresr[MAXNAMESZ];
data/alttab-1.5.0/src/ewmh.c:107:9:  [1] (obsolete) usleep:
  This C routine is considered obsolete (as opposed to the shell command by
  the same name). The interaction of this function with SIGALRM and other
  timer functions such as sleep(), alarm(), setitimer(), and nanosleep() is
  unspecified (CWE-676). Use nanosleep(2) or setitimer(2) instead.
        usleep(WM_POLL_INTERVAL);
data/alttab-1.5.0/src/icon.c:102:21:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    int theme_len = strlen(g.option_theme);
data/alttab-1.5.0/src/icon.c:115:18:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
        id2len = strlen(icondir[hd]) + 1;
data/alttab-1.5.0/src/icon.c:121:23:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
            id2len += strlen(home);
data/alttab-1.5.0/src/icon.c:131:13:  [1] (buffer) strcat:
  Does not check for buffer overflows when concatenating to destination
  [MS-banned] (CWE-120). Consider using strcat_s, strncat, strlcat, or
  snprintf (warning: strncat is easily misused). Risk is low because the
  source is a constant character.
            strcat(id2, "/");
data/alttab-1.5.0/src/icon.c:132:13:  [1] (buffer) strncat:
  Easily used incorrectly (e.g., incorrectly computing the correct maximum
  size to add) [MS-banned] (CWE-120). Consider strcat_s, strlcat, snprintf,
  or automatically resizing strings.
            strncat(id2, g.option_theme, theme_len);
data/alttab-1.5.0/src/icon.c:146:28:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
            for (k = xdg + strlen(xdg) - 1; *k == '/'; k--) {
data/alttab-1.5.0/src/icon.c:149:22:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
            id2len = strlen(xdg) + strlen("/icons/") + theme_len + 1;
data/alttab-1.5.0/src/icon.c:149:36:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
            id2len = strlen(xdg) + strlen("/icons/") + theme_len + 1;
data/alttab-1.5.0/src/icon.c:300:5:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
    strncpy(app, fname, applen);
data/alttab-1.5.0/src/icon.c:312:9:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
        strncpy(sx, dim, (xchar - dim));
data/alttab-1.5.0/src/icon.c:315:9:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
        strncpy(sy, xchar + 1, dim + dimlen - xchar);
data/alttab-1.5.0/src/icon.c:338:13:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
            strncpy(sx, uchar+1, (xchar - uchar - 1));
data/alttab-1.5.0/src/icon.c:346:13:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
            strncpy(sy, xchar + 1, app + strlen(app) - xchar);
data/alttab-1.5.0/src/icon.c:346:42:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
            strncpy(sy, xchar + 1, app + strlen(app) - xchar);
data/alttab-1.5.0/src/icon.c:347:22:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
            sy[app + strlen(app) - xchar] = '\0';
data/alttab-1.5.0/src/icon.c:361:23:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
        digit = app + strlen(app) - 2;
data/alttab-1.5.0/src/icon.c:362:23:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
        minus = app + strlen(app) - 3; // trick for gcc-10 pseudo-intelligence
data/alttab-1.5.0/src/icon.c:384:9:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
        strncpy(ic->app, app, MAXAPPLEN);
data/alttab-1.5.0/src/icon.c:385:9:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
        strncpy(ic->src_path, pe->fts_path, MAXICONPATHLEN-1);
data/alttab-1.5.0/src/icon.c:397:13:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
            strncpy(ic->src_path, pe->fts_path, MAXICONPATHLEN-1);
data/alttab-1.5.0/src/rp.c:124:9:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    if (strlen(ratpoison_cmd) < 2) {
data/alttab-1.5.0/src/rp.c:183:5:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120). Risk is low because the source is a
  constant string.
    strncpy(arg2, "groups", arg2len);
data/alttab-1.5.0/src/util.c:187:18:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
            rb = read(link[0], buf, bufsize);
data/alttab-1.5.0/src/util.c:417:57:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    XftTextExtentsUtf8(dpy, font, (unsigned char *)str, strlen(str), &ext);
data/alttab-1.5.0/src/util.c:430:9:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
        strncpy(line, line_from_char, M);
data/alttab-1.5.0/src/util.c:432:21:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
        line_clen = strlen(line);
data/alttab-1.5.0/src/util.c:451:21:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
        line_clen = strlen(line);
data/alttab-1.5.0/src/util.c:464:25:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
            line_clen = strlen(line);
data/alttab-1.5.0/src/util.c:530:9:  [1] (buffer) strncat:
  Easily used incorrectly (e.g., incorrectly computing the correct maximum
  size to add) [MS-banned] (CWE-120). Consider strcat_s, strlcat, snprintf,
  or automatically resizing strings.
        strncat(line, add, 26);
data/alttab-1.5.0/src/win.c:333:27:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
             tryclass += (strlen(tryclass) + 1)) {
data/alttab-1.5.0/src/win.c:388:9:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
        strncpy(g.winlist[g.maxNdx].name, wm_name, MAXNAMESZ-1);
data/alttab-1.5.0/src/win.c:397:13:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
            strncpy(g.winlist[g.maxNdx].name, (char *)wn, MAXNAMESZ-1);

ANALYSIS SUMMARY:

Hits = 67
Lines analyzed = 5463 in approximately 0.14 seconds (39347 lines/second)
Physical Source Lines of Code (SLOC) = 3905
Hits@level = [0]  38 [1]  33 [2]  25 [3]   3 [4]   6 [5]   0
Hits@level+ = [0+] 105 [1+]  67 [2+]  34 [3+]   9 [4+]   6 [5+]   0
Hits/KSLOC@level+ = [0+] 26.8886 [1+] 17.1575 [2+] 8.70679 [3+] 2.30474 [4+] 1.53649 [5+]   0
Dot directories skipped = 1 (--followdotdir overrides)
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.